linux-kernel - Re: [PATCH V3 17/17] KVM: compat: riscv: Prevent KVM

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Date:   Thu, 20 Jan 2022 11:10:53 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Guo Ren <guoren@...nel.org>
Cc:     Palmer Dabbelt <palmer@...belt.com>, Arnd Bergmann <arnd@...db.de>,
        Anup Patel <anup@...infault.org>,
        gregkh <gregkh@...uxfoundation.org>,
        liush <liush@...winnertech.com>, Wei Fu <wefu@...hat.com>,
        Drew Fustini <drew@...gleboard.org>,
        Wang Junqiang <wangjunqiang@...as.ac.cn>,
        Christoph Hellwig <hch@....de>,
        Christoph Hellwig <hch@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        linux-csky@...r.kernel.org,
        linux-s390 <linux-s390@...r.kernel.org>,
        sparclinux <sparclinux@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        inux-parisc@...r.kernel.org,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Guo Ren <guoren@...ux.alibaba.com>
Subject: Re: [PATCH V3 17/17] KVM: compat: riscv: Prevent KVM_COMPAT from
 being selected

On Thu, Jan 20, 2022 at 8:39 AM <guoren@...nel.org> wrote:
>
> From: Guo Ren <guoren@...ux.alibaba.com>
>
> Current riscv doesn't support the 32bit KVM/arm API. Let's make it
> clear by not selecting KVM_COMPAT.
>
> Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
> ---
>  virt/kvm/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig
> index f4834c20e4a6..a8c5c9f06b3c 100644
> --- a/virt/kvm/Kconfig
> +++ b/virt/kvm/Kconfig
> @@ -53,7 +53,7 @@ config KVM_GENERIC_DIRTYLOG_READ_PROTECT
>
>  config KVM_COMPAT
>         def_bool y
> -       depends on KVM && COMPAT && !(S390 || ARM64)
> +       depends on KVM && COMPAT && !(S390 || ARM64 || RISCV)

Maybe this should be flipped around into a positive list now?
The remaining architectures would be mips, powerpc and x86, but it's unclear
if this actually meant to work on all of them, or any potential ones
added in the
future.

       Arnd